I did search the forum but couldn't find a clear statement whether I can subscribe (I don't want to import) to a Zimbra-Calendar with - say - Google Calendar or iCal or 30boxes.com.
In my case my server behind a CAcert-signed certificate. Severeal attempts to subscribed to Zimbra-Calendars failed.
Am I correct with that evaluation? Did I miss something because I thought that I can subscribe(!) to the calendars via ics.
Thanks for your help
[Update]: It can work def. with just http:// see this post.